python原生操作mysql

 import pymysql

 HOST = '127.0.0.1'
 PORT = 3306
 USER = 'root'
 PASSWD = ''
 DB = 'test'
 CHARSET = 'utf8'

 conn = pymysql.connect(
     host=HOST,
     port=PORT,
     user=USER,
     passwd=PASSWD,
     db=DB,
     charset=CHARSET
 )

 cursor = conn.cursor()

 create_dep = """CREATE TABLE department(
 dep_id INT PRIMARY KEY,
 dep_name VARCHAR(20) NOT NULL UNIQUE
 )"""

 create_emps = """CREATE TABLE employees(
 emp_id INT PRIMARY KEY,
 emp_name VARCHAR(20) NOT NULL UNIQUE,
 birth_date DATE,
 email VARCHAR(30),
 dep_id INT,
 FOREIGN KEY(dep_id) REFERENCES department(dep_id)
 )"""

 create_slary = """CREATE TABLE slary(
 auto_id INT PRIMARY KEY,
 date DATE,
 basic INT,
 awards INT,
 emp_id INT,
 FOREIGN KEY(emp_id) REFERENCES employees(emp_id)
 )"""

 # cursor.execute(create_dep)
 # cursor.execute(create_emps)
 # cursor.execute(create_slary)

 # insert = 'insert into department VALUES (%s,%s)'
 # cursor.execute(insert,(1,'HR'))
 # cursor.execute(insert,(2,'DEVOPS'))
 # cursor.execute(insert,(3,'DEV'))
 # cursor.executemany(insert,[(4,'OPS'),(5,'MANAGER')])

 # select = 'select * from department order by dep_id'
 # cursor.execute(select)
 # result = cursor.fetchone()
 # print(result)
 # result = cursor.fetchmany(2)
 # print(result)
 # result = cursor.fetchall()
 # print(result)

 # select = 'select * from department order by dep_id'
 # cursor.execute(select)
 # cursor.scroll(4)  # 默认以相对方式，从当前位置向下移动
 # result = cursor.fetchone()
 # print(result)
 # cursor.scroll(0,mode='absolute')  # absolute 一定是从开头移动
 # result = cursor.fetchone()
 # print(result)

 #
 # update1 = 'update department set dep_name=%s where dep_name=%s'
 # cursor.execute(update1,('rs','HR'))

 delete1 = 'delete from department where dep_id=%s'
 cursor.execute(delete1,(5,))

 conn.commit()

 cursor.close()
 conn.close()
 if __name__ == "__main__":
     pass